Autor: Wysocki, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On a method to improve correlation properties of orthogonal polyphase spreading sequences
Autorzy:: Wysocki, B. J.
Wysocki, T. A.
Powiązania:: https://bibliotekanauki.pl/articles/307741.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: spread spectrum communications
orthogonal sequences
wireless communications
wireless LAN
correlation
Opis:: In this paper, we propose a simple but efficient method for improving correlation properties of polyphase spreading sequences for asynchronous direct sequence code division multiple access (DS CDMA) applications. The proposed method can be used to reduce the mean square value of aperiodic crosscorrelation or the mean square value of aperiodic autocorrelation, the maximum value of aperiodic crosscorrelation functions, merit factor or other properties of the sequence set. The important feature of the method is that while it modifies correlation properties of the sequence set, it preserves sequence orthogonality for perfect synchronization, if this is the property of the original sequence set.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 2; 99-105
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On a method to authenticate and verify digital streams
Autorzy:: Wysocki, B.J.
Wang, Y.
Safavi-Naini, R.
Powiązania:: https://bibliotekanauki.pl/articles/309279.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: authentication algorithms
hash chains
signing digital streams
Markov modelling
Gilbert-Elliott channels
Opis:: Recently, digital streams have become widely used to make audio, video, and other media available in real-time over the Internet. As with other transmission methods, the recipient needs to have a possibilty to verify the source and authenticity of the received information. Several techniques have been proposed to deal with this issue. Most of them are vulnerable to packet losses or they introduce unacceptable computational and/or communication overheads. Some of the graph-based techniques provide immunity to burst losses of certain length. However, these techniques are not immune to the loss of packets containing signatures or occasional burst of lengths greater than the assumed one. In the paper, we propose a modification to one of the graph-based techniques that introduces immunity to the loss of packets containing signatures, without introducing any additional overheads.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 45-52
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Walsh-chirp sequences for wireless applications
Autorzy:: Wysocki, B. J.
Wysocki, T. A.
Zepernick, H.-J.
Powiązania:: https://bibliotekanauki.pl/articles/309560.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: spread spectrum communications
polyphase spreading sequences
multi-access interference
Walsh sequences
aperiodic correlation functions
Opis:: This paper deals with a new method to design polyphase spreading sequences for DS CDMA wireless applications. The method is based on weighting symbols of the orthogonal Walsh sequences by the complex factors being symbols of baseband chirp sequences. The resulting sequences possess good aperiodic correlation properties, while maintaining the orthogonality. Because of the parametric design, the sequences can be optimized to achieve desired characteristics.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 3; 24-28
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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